In the S3-type semiconductor laser, when an angle of a first growth profile line to the first principal plane, the first growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane of the first layer of the first conduction type cladding layer is null1, an angle of a second growth profile line to the first principal plane, the second growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane of the second layer of the first conduction type cladding layer is null2, an angle of a third growth profile line to the first principal plane, the third growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane of the third layer of the first conduction type cladding layer is null3, and an angle of a fourth growth profile line to the first principal plane, the fourth growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane of the fourth layer of the first conduction type cladding layer is null4, relationships null1 null3, null3